On April 7, 2021 the Muon g-2 Experiment at Fermilab presented its first results. Combined with the previous Brookhaven National Laboratory E821 measurement this leads to a new experimental average of the muon anomalous magnetic dipole moment of \(a_{\mu }(\mathrm {Exp})=\frac{g_{\mu }-2}{2}=16 592 061(41)\times 10^{-11}\) . The difference \(a_{\mu }(\mathrm {Exp})-a_{\mu }(\mathrm {SM})=(251\pm 59)\cdot 10^{-11}\)  has a significance of 4.2\(\sigma \)  [1]}.
